Hoist driving mechanism



Jan. 5, 1943. R. B. MAGEE HOIST DRIVING MECHANISM 2' sheets-sheet 1 `Filed Dec. 24, 1940 NNU ha /M M mw..

INVENTOR f W5/?? ATTOR EY Jan. 5, 1943. R. B. MAGEE 2,307,284

HOIST DRIVING MECHANISM Filed Dec. 24. 1940 2 sheets-sheet 2 I'NVEN-oR @Ma/@ff Patented Jan. 5, 1943 cuirs TES P HCE Buckeye Traction Ditcher Company,

Findlay,

Ohio, a corporation of Ohio Applica-tion December 24, 1940, Serial No. 371,507

1 Claim.

This invention relates to driving mechanisms particularly adapted for driving a hoist or a Winch mounted at the rear end of a tractor of the type used for raising or lowering earth working tools such as bulldozers, operating Scrapers which are towed by the tractor and for numerous other purposes, but more particularly to mechanism or an adaptor interposed between the tractor operating motor Iand the hoist for establishing the drive between these parts in the desired manner.

An object is to produce a new and improved drive for a tractor operated hoist or winch for enabling the hoist to be selectively operated or driven in either direction in such manner as to enable the tractor motor to serve as a brake when the Winch is operated in a reverse direction, thus to pay out the cable from the winch at a controlled speed and under power.

Another object s to produce a simple and ecient adaptor for a tractor driven winch or hoist enabling the winch to be driven selectively in one direction or the opposite direction but does not interfere with or otherwise change the operation of the winch.

A further object is to provide a hoist drive mechanism of the above character with means for militating against actuation of one of the clutch members to operative clutching position until the other clutch member is disposed in neutral position and positively holding the latter "l clutch member in neutral position until the first clutch member is returned to its inoperative position.

Other objects and advantages reside in details of construction, arrangement and operation and for purposes of illustration but not of limitation, an embodiment of the invention is shown in the accompanying drawings in which:

Figure 1 is a vertical sectional elevation of the driving mechanism for a hoist with the clutches arranged for normal driving of a hoist, part of which is broken away and indicating the motor driven shaft leading from the tractor operating motor;

Figure 2 is an enlarged transverse sectional'elevation on the line 2--2 of Figure 1;

Figure 3 is an enlarged side elevation of the adaptor showing the clutch operating levers and showing the position assumed by the parts when n both clutches are in neutral position.

The illustrated embodiment of the invention comprises a hoist H which is suitably mounted at the rear end of a tractor (not shown). The details of construction of the hoist form no part of `the present invention so that detail description 55 and illustration thereof are not considered necessary. Su-ilce it to say that the hoist I-I is provided with one or more drums on which a cable or cables are wound, the drums being rotatable in opposite directions to wind up or pay out the cable as desired. A hoist of this character is shown and described in the patent to Frank P. Lawler, No. 2,199,668, dated May 7, 1940, for Hoist I'he hoist is provided with a drum operating shaft I0 to which a beveled gear l I is secured and meshing with the beveled gear II is a bevel pinion I2 secured to a driven shaft I3. The shaft I3 is suitably mounted in anti-friction bearings l4 mounted in a portion of the hoist casing I5.

Fitting against the rear face of the hoist casing I5 is a relatively oil-tight casing I6 which houses the driving mechanism which receives its power from a driving shaft il. The shaft I 'I may be an extension of the drive shaft to the tractor motor or may be a separate shaft suitably connected for operation by the tractor motor so as to be rotated continuously in one direction so long as it is desired to have the hoist H available for operation.

The inner end of the hoist driven shaft I3 is provided with longitudinal splines as indicated at I'8 to receive a gear member I9 having external gear teeth 20 and internal gear teeth 2 l. The eX- treme end portion of the driven shaft I3 is screw-threaded as indicated at 22 to receive a suitable fastening device 23 for securing the gear member I9 in place. AXially aligned with the driven shaft I3 and having its inner end spaced a short distance from the adjacent end oi the hoist driven shaft I3 is a supplemental driven shaft 24 which is suitably supported by antifriction bearings 25, a bracket 26 forming a part of the housing I'B. The inner end of the supplemental driven shaft 24 has a series of splines 21 to receive a gear clutch member 28 which is likewise splined to interiit with the splines 2l and is mounted for longitudinal shifting movements upon the supplemental driven shaft 2,4. The clutch member 28 is formed with an external gear 29 at one end adapted to mesh with the internal gear 2| on the gear member I 9 thereby to drive the hoist driven shaft I3 from the supplemental shaft 24. The clutch member 23 is formed with a groove collar 30 for receiving diametri-cally opposed substantially rectangular ngers 3| carried by a yoke 32. The clutch operating yoke 32 is fixed to a transverse shaft 33 which is suitably mounted in the housing I 6 and for centering purposes is engaged at one end by a bolt 34 which is secured in place by a nut 35. The opposite end of the shaft 33 projects outwardly of the housing I6 and sleeved thereupon is a hub portion 38 of an operating handle 31, the hub portion being fixed to the shaft 33 for turning movements therewith. It will be manifest that by actuation of the handle 31 the gear clutch 28 may be sild into and out of engagement with the internal gear 2 I.

The clutch actuating yoke 3E is yieldably retained either in the inoperative position of the clutch member 28 or in the operative position thereof with the gears 23 and 2l in mesh, by a ball 38 which is engageable either in a socket 39 or a socket 40 formed in the outer side wall of the yoke. The ball 38 is urged outwardly of a cup 4I carried by a sid-e wall of the housing I3 by a coil spring 42. The spring 42 bears at 'one end against the ball 33 urging it outwardly of the cup and at the opposite end against the inner end of the cup.

The supplemental driven shaft -24 is driven by the motor driven shaft I1 and in the same direction of rotation as the shaft I1. In .this instance, the'operative driving connection between .q

these shafts is effected `by a sprocket member 4.3 which is splined to and slidable axially of the motor driven shaft I1 and a sprocket member 44 which is suitably fixed to the supplemental driven shaft 24 for rotation therewith. In this instance each of the sprocket members 43 and 44 is formed with-four annular series of sprocket teeth and 'the opposite sprocket teeth of one of .the members is connected to the corresponding sprocket of the other member by chains 45. A i

sprocket and chain connection of this character is of particular advantage in that it enables the supplemental driven shaft 24 to be rotated in the same direction as the motor driven shaft i1 which is disposed parallel thereto but spaced lat- .f

erally therefrom.

The motor driven shaft I1 is suitably mounted in anti-friction bearings 45 carried by the face plate 41 of the housing I5 and disposed in alignment with but spaced slightly therefrom is a sup.- plemental driving shaft 41 which has a splined end portion 48 to receive a gear clutch member 49 having an external gear 5U which is movable axially to and from meshing engagement with an internal gear 5I forming an integral part of the sprocket member 43 at the inner end thereof. The gear clutch member 49 is shifted axially along the splined Yend portion 48 of the supplemental shaft by a yoke 52 which is similar to the yoke 32 above described. The yoke 52 is similarly mounted to the yoke 32 and is provided with an operating handle 53 (Figure 3) which is in all respects identical to the handle 31 above described. In view of the similarity of these parts further detail description of the yoke 52 and its associated parts is not considered necessary since the same will be vreadily understood bythose skilled in this art.

The supplemental driving shaft 41 is suitably mounted in anti-friction bearings 54 carried by the housing I6 and rigid with the opposite end portion thereof is an external gear 55 which is at all times in mesh with the gear 2U which, as above described, is fixed for rotation with the hoist driven shaft I3.

It will be understood that the housing I6 is normally filled with oil so that the Various parts run in a bath of oil, a suitable breather 56 being provided for venting the interior of the housing.

It will be manifest that when the gear clutch member 23 is engaged with the internal gear 2|, the hoist shaft I3 will be rotated in the same direction as the motor driven shaft I1. At this time the gear clutch 49 is disposed in inoperative position with the gear 50 shifted away from the gear 5 I. On the other hand, with the gear clutch 28 shifted to inoperative position or to such position that the gears 29 and 2I are out of mesh, the clutch member 49 may be shifted to operative position to bring the gears 50 and 5I into mesh. With the parts in this position, the hoist shaft I3 is driven from the motor driven shaft I1 through the supplemental driving shaft 41 and gears 55 and 23. With the parts connected in this manner which constitutes the normal drive for the hoist, the hoist shaft will be driven in a direction of rotation opposite to that of the motor driven shaft I1. This construction makes possible the normal driving of the cable drum of the hoist H in one direction but when it is desired to rotate the cable drum in the opposite direction and by shifting the clutch members as above described, the cable drum may be reversed and the motor which operates the shaft l1 may serve as a brake to check the rotation of the hoist drum but at the same time operating the drum by power means.

It is important that while one of the clutch members 23 and 49 is in operative position that the other clutch member be retained in inoperative position. For this purpose, each of the operating handles or levers 31 and 53 is provided with a laterally extending arm 51 to whicha pin 58 is pivoted. The free end portion of each'of the pins 58 passes through a boss 59. When both of the operating handles 31 and 53 are in neutral position, the operating levers or handles 31 and 53 are in the positions indicated on Figure 3, the pins 58 projecting through their respective bosses 59 and terminating close to but out of engagement with the opposite operating handle. As shown, each of the handles 31 and 53 is provided adjacent their outer ends with an arcuate portion or sector G3 of such curvature that the respective handle can be rocked without interference from the pin 58 of the other operating handle. However, upon swinging movement of either of the operating handles 31 and 53, it will be apparent that the respective pin 58 is forced longitudinally -through the respective boss 59 and into a socket El formed in the other operating handle, a sufficiently loose t between the pin 58 and boss 59 enabling this movement to be accomplished. It is manifest that when one of the pins is in engagement with the socket El of the other arm, the latter is locked against movement thereby retaining the respective gear clutch in inoperative or neutral position. This is a safety factor which miltates against accidental damage or injury to the gears. It will also be understood that both of the operating handles 31 and 53 must again be in neutral position or in the position indicated on Figure 3 before the other operating handle can be actuated and at that time the first operating handle is positively retained in neutral position. As above indicated, both the operating handles and associated parts are similarly constructed so that detail description of one is deemed sufficient.

It is apparent that the hoist driven shaft I3 is spaced vertically above the tractor driving shaft I1. This is advantageous because it enables the hoist H to be raised above the usual drawbar of the tractor. It is to be understoodthat the hoist may be mounted at any desired place on the tractor and accordingly the drive mechanism above described may be mounted at the rear, sides or front of-the tractor as desired depending upon the position of mounting for the hoist.

It is to be understood that numerous changes in details of construction, arrangement and operation may be effected Without departing from the spirit of the invention especially as dened in the appended claim.

What I claim is: Y

A driving mechanism including a driving shaft, a drivenshaft, a clutch member fixed on the driven shaft and having external and internal teeth, a supplemental driven shaft, a clutch member slidably splined on one end of the supplemental driven shaft and having a single series of external jteeth engageable only with the internal teeth of the rst named clutch member, a sprocket and 'chain connection between the opposite end of lthesupplemental driven shaft and the driving shaft to rotate the supplemental driven shaft from' and in the same direction as the driving shaft, a supplemental driving shaft, an internally toothed member fixed on said driving shaft, a clutch member slidably splined on the supplemental driving shaft and having a single series of external teeth for engagement only with the internal teeth of said member of the driving shaft, a gear on the supplemental driving shaft engaged with the external teeth of the clutch member of the driven shaft, and means to actuate each the slidable clutch members of the supplemental driven and driving shafts.

ROBERT B. MAGEE. 

